单项选择题

Which of the following is TRUE of cell phone users（）

A．They must accept the alert service.
B．They may enjoy the alert service for free.
C．They must send the alerts to others.
D．They may choose the types of messages.

<上一题目录下一题>

热门试题

单项选择题

29（）

A．As
B．Where
C．Unless
D．When

单项选择题

From this passage, we learn that most TV stations in the world devoted more broadcasting hours to （）

A．educational programs
B．entertainment programs
C．news information programs
D．dramas, serials, music, sports and so on